All you need to do is put in parameters compatible with your checkpoint as usual (CFG, Sampler,..) and run it, parameters are linked to the KSampler as well as Image Saver so all generation data is transferred to the metadata of the image automatically.
Experiment with bypassing (ctlr + B) nodes: CFGZeroStar, rescaleCFG, FreeU_V2, SAG. There is a note that should help with setting it's values.
To use ADetailer (FaceDetailer), upscale or controlnet click on the Enable Group button in Fast Groups Bypasser (rgthree).
ComfyUI clips skip -2 is equivalent of 1 in a1111, if you want to set clip skip to 0 just bypass the node.
Controlnet model for SDXL based checkpoints: https://huggingface.co/brad-twinkl/controlnet-union-sdxl-1.0-promax
3D posing: https://webapp.magicposer.com/
Token counter works only up to 77 tokens due to ComfyUI limitations.
Best on a 1440p display. >:]
If you are completely new to ComfyUI just check names of nodes in properties and study. :)